Spin fluctuations and pairing symmetry in AFeSe: dual effect of the itinerant and the localized nature of electrons
arXiv:1305.1090 · doi:10.1088/0953-8984/25/44/445702
Abstract
We investigate the spin fluctuations and the pairing symmetry in AFeSe by the fluctuation exchange approximation. Besides the on-site interactions, the next-nearest-neighbor antiferromagnetic coupling is also included. We find that both the itinerant and the localized natures of electrons are important to describe the recent experimental results of the spin fluctuations and the pairing symmetry. In particular, a small coupling can change the pairing gap from the d-wave symmetry to the s-wave symmetry. We have also studied the real-space structures of the gap functions for different orbits in order to gain more insight on the nature of the pairing mechanism.
8 pages, 6 figures
References in corpus (19)
- Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
- Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
- Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
- Fe-based high temperature superconductivity with Tc=31K bordering an insulating antiferromagnet in (Tl,K)FexSe2 Crystals
- Superconductivity at 32 K in single crystal RbFeSe}
- d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors
- Pairing State with a time-reversal symmetry breaking in FeAs based superconductors
- Strong nodeless pairing on separate electron Fermi surface sheets in (Tl, K)FeSe probed by ARPES
- Inter-pocket pairing and gap symmetry in Fe-based superconductors with only electron pockets
- Spin waves in the magnetically ordered iron chalcogenide FeTe
- Neutron-Diffraction Measurements of an Antiferromagnetic Semiconducting Phase in the Vicinity of the High-Temperature Superconducting State of KFeSe
- Angle-resolved photoemission evidence of s-wave superconducting gap in KxFe2-ySe2 superconductor
- 77Se NMR Investigation of the K(x)Fe(2-y)Se(2) High Tc Superconductor (Tc=33K)
- Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictides
- Nodeless superconductivity in KFeSe single crystals revealed by low temperature specific heat
- Band renormalization and Fermi surface reconstruction in iron-based superconductors
- Observation of an isotropic superconducting gap at the Brillouin zone center of TlKFeSe
- Spin-wave excitations and superconducting resonant mode in Cs(x)Fe(2-y)Se2
- Possible Superconducting Symmetry and Magnetic Correlations in K0.8Fe2Se2: A 77Se-NMR Study